diff options
Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h')
| -rw-r--r-- | intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h b/intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h index 8d7d533d6f8..9929246ae5c 100644 --- a/intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h +++ b/intern/cycles/kernel/closure/bsdf_ashikhmin_shirley.h @@ -31,28 +31,30 @@ Other than that, the implementation directly follows the paper. CCL_NAMESPACE_BEGIN -ccl_device int bsdf_ashikhmin_shirley_setup(ShaderClosure *sc) +ccl_device int bsdf_ashikhmin_shirley_setup(MicrofacetBsdf *bsdf) { - sc->data0 = clamp(sc->data0, 1e-4f, 1.0f); - sc->data1 = sc->data0; + bsdf->alpha_x = clamp(bsdf->alpha_x, 1e-4f, 1.0f); + bsdf->alpha_y = bsdf->alpha_x; - sc->type = CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID; + bsdf->type = CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID; return SD_BSDF|SD_BSDF_HAS_EVAL; } -ccl_device int bsdf_ashikhmin_shirley_aniso_setup(ShaderClosure *sc) +ccl_device int bsdf_ashikhmin_shirley_aniso_setup(MicrofacetBsdf *bsdf) { - sc->data0 = clamp(sc->data0, 1e-4f, 1.0f); - sc->data1 = clamp(sc->data1, 1e-4f, 1.0f); + bsdf->alpha_x = clamp(bsdf->alpha_x, 1e-4f, 1.0f); + bsdf->alpha_y = clamp(bsdf->alpha_y, 1e-4f, 1.0f); - sc->type = CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID; + bsdf->type = CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID; return SD_BSDF|SD_BSDF_HAS_EVAL; } ccl_device void bsdf_ashikhmin_shirley_blur(ShaderClosure *sc, float roughness) { - sc->data0 = fmaxf(roughness, sc->data0); /* clamp roughness */ - sc->data1 = fmaxf(roughness, sc->data1); + MicrofacetBsdf *bsdf = (MicrofacetBsdf*)sc; + + bsdf->alpha_x = fmaxf(roughness, bsdf->alpha_x); + bsdf->alpha_y = fmaxf(roughness, bsdf->alpha_y); } ccl_device_inline float bsdf_ashikhmin_shirley_roughness_to_exponent(float roughness) @@ -60,16 +62,21 @@ ccl_device_inline float bsdf_ashikhmin_shirley_roughness_to_exponent(float rough return 2.0f / (roughness*roughness) - 2.0f; } -ccl_device float3 bsdf_ashikhmin_shirley_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf) +ccl_device_inline float3 bsdf_ashikhmin_shirley_eval_reflect( + const ShaderClosure *sc, + const float3 I, + const float3 omega_in, + float *pdf) { - float3 N = sc->N; + const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc; + float3 N = bsdf->N; float NdotI = dot(N, I); /* in Cycles/OSL convention I is omega_out */ float NdotO = dot(N, omega_in); /* and consequently we use for O omaga_in ;) */ float out = 0.0f; - if(fmaxf(sc->data0, sc->data1) <= 1e-4f) + if(fmaxf(bsdf->alpha_x, bsdf->alpha_y) <= 1e-4f) return make_float3(0.0f, 0.0f, 0.0f); if(NdotI > 0.0f && NdotO > 0.0f) { @@ -82,8 +89,8 @@ ccl_device float3 bsdf_ashikhmin_shirley_eval_reflect(const ShaderClosure *sc, c float pump = 1.0f / fmaxf(1e-6f, (HdotI*fmaxf(NdotO, NdotI))); /* pump from original paper (first derivative disc., but cancels the HdotI in the pdf nicely) */ /*float pump = 1.0f / fmaxf(1e-4f, ((NdotO + NdotI) * (NdotO*NdotI))); */ /* pump from d-brdf paper */ - float n_x = bsdf_ashikhmin_shirley_roughness_to_exponent(sc->data0); - float n_y = bsdf_ashikhmin_shirley_roughness_to_exponent(sc->data1); + float n_x = bsdf_ashikhmin_shirley_roughness_to_exponent(bsdf->alpha_x); + float n_y = bsdf_ashikhmin_shirley_roughness_to_exponent(bsdf->alpha_y); if(n_x == n_y) { /* isotropic */ @@ -97,12 +104,18 @@ ccl_device float3 bsdf_ashikhmin_shirley_eval_reflect(const ShaderClosure *sc, c else { /* anisotropic */ float3 X, Y; - make_orthonormals_tangent(N, sc->T, &X, &Y); + make_orthonormals_tangent(N, bsdf->T, &X, &Y); float HdotX = dot(H, X); float HdotY = dot(H, Y); - float e = (n_x * HdotX*HdotX + n_y * HdotY*HdotY) / (1.0f - HdotN*HdotN); - float lobe = powf(HdotN, e); + float lobe; + if(HdotN < 1.0f) { + float e = (n_x * HdotX*HdotX + n_y * HdotY*HdotY) / (1.0f - HdotN*HdotN); + lobe = powf(HdotN, e); + } + else { + lobe = 1.0f; + } float norm = sqrtf((n_x + 1.0f)*(n_y + 1.0f)) / (8.0f * M_PI_F); out = NdotO * norm * lobe * pump; @@ -128,13 +141,14 @@ ccl_device_inline void bsdf_ashikhmin_shirley_sample_first_quadrant(float n_x, f ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf) { - float3 N = sc->N; + const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc; + float3 N = bsdf->N; float NdotI = dot(N, I); if(NdotI > 0.0f) { - float n_x = bsdf_ashikhmin_shirley_roughness_to_exponent(sc->data0); - float n_y = bsdf_ashikhmin_shirley_roughness_to_exponent(sc->data1); + float n_x = bsdf_ashikhmin_shirley_roughness_to_exponent(bsdf->alpha_x); + float n_y = bsdf_ashikhmin_shirley_roughness_to_exponent(bsdf->alpha_y); /* get x,y basis on the surface for anisotropy */ float3 X, Y; @@ -142,7 +156,7 @@ ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng, if(n_x == n_y) make_orthonormals(N, &X, &Y); else - make_orthonormals_tangent(N, sc->T, &X, &Y); + make_orthonormals_tangent(N, bsdf->T, &X, &Y); /* sample spherical coords for h in tangent space */ float phi; @@ -193,7 +207,7 @@ ccl_device int bsdf_ashikhmin_shirley_sample(const ShaderClosure *sc, float3 Ng, /* reflect I on H to get omega_in */ *omega_in = -I + (2.0f * HdotI) * H; - if(fmaxf(sc->data0, sc->data1) <= 1e-4f) { + if(fmaxf(bsdf->alpha_x, bsdf->alpha_y) <= 1e-4f) { /* Some high number for MIS. */ *pdf = 1e6f; *eval = make_float3(1e6f, 1e6f, 1e6f); |